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Ch8函数探幽/函数模板/twoswap.cpp

+//twoswap.cpp -- specialization overrides a template
+#include <iostream>
+template <typename T>
+void Swap(T& a, T& b);
+
+struct job
+{
+	char name[40];
+	double salary;
+	int floor;
+};
+
+//explicit specialization for the job type
+template <> void Swap<job>(job& j1, job& j2);
+void Show(job& j);
+
+
+
+int main(void)
+{
+	using namespace std;
+	cout.precision(2);
+	cout.setf(ios::fixed, ios::floatfield);
+	int i = 10, j = 20;
+	cout << "i, j = " << i << ", " << j << ".\n";
+
+
+	job sue = { "Susan Yaffee",73000.60,7 };
+	job sidney = { "Sidney Taffee",78060.72,9 };
+	cout << "Before job swapping:\n";
+	Show(sue);
+	Show(sidney);
+	Swap(sue, sidney);		//uses void Swap(job&,job&)
+
+
+	cout << "After job swapping:\n";
+	Show(sue);
+	Show(sidney);
+	cin.get(); 
+
+
+	return 0;
+}
+
+template<typename T>
+void Swap(T& a, T& b)		//general version
+{
+	T temp;
+	temp = a;
+	a = b;
+	b = temp;
+}
+
+//swaps just the salary and floor fields of a job  structure
+template<>void Swap<job>(job& j1, job& j2)	//specialization
+{
+	double t1;
+	int t2;
+	t1 = j1.salary;
+	j1.salary = j2.salary;
+	j2.salary = t1;
+	t2 = j1.floor;
+	j1.floor = j2.floor;
+	j2.floor = t2;
+}
+
+void Show(job& j)
+{
+	using namespace std;
+	cout << j.name << ": $" << j.salary
+		<< " on floor " << j.floor << endl;
+}